I had one just like this I took the bubble maker out, so I could hook the air pump to a sponge filter plus he had plenty of extra room. I just bought a new ten gallon from a neighbor. 15 dollars for a 10 gallon with a filter and a hood along with a truckload of decorations and refills for the filter.

Here's my new fella, White Lightening, the Dragon Slayer. I "rescued" him from a certain death from Walmart. I still cant believe they had such a BEAUTIFUL Betta !! He also has his 10 little "Minions" the Neons.